Commutativity.
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1. 7d-13=3d+72. 7d-20=3d3. -20=-4d4. d=55. Check your answer:7*5-13=22, 3*5+7=22D equals 5
The coefficient of 3+7d is 7
The Commutative Property of Addition
the commutative property of addition
This is called the Commutative property of addition.